#!/usr/bin/env python
# -*- coding: UTF-8 -*-

from __future__ import print_function

# change those symbols to whatever you prefer
symbols = {'ahead of': '↑', 'behind': '↓', 'prehash':':'}

from subprocess import Popen, PIPE

import sys
gitsym = Popen(['git', 'symbolic-ref', 'HEAD'], stdout=PIPE, stderr=PIPE)
branch, error = gitsym.communicate()

error_string = error.decode('utf-8')

if error_string.find('fatal: Not a git repository') != -1:
	sys.exit(0)

branch = branch.strip()[11:]

res, err = Popen(['git','diff','--name-status'], stdout=PIPE, stderr=PIPE).communicate()
err_string = err.decode('utf-8')
if err_string.find('fatal') != -1:
	sys.exit(0)
changed_files = [namestat[0] for namestat in res.splitlines()]
staged_files = [namestat[0] for namestat in Popen(['git','diff', '--staged','--name-status'], stdout=PIPE).communicate()[0].splitlines()]
nb_changed = len(changed_files) - changed_files.count('U')
nb_U = staged_files.count('U')
nb_staged = len(staged_files) - nb_U
staged = str(nb_staged)
conflicts = str(nb_U)
changed = str(nb_changed)
nb_untracked = len(Popen(['git','ls-files','--others','--exclude-standard'],stdout=PIPE).communicate()[0].splitlines())
untracked = str(nb_untracked)
if not nb_changed and not nb_staged and not nb_U and not nb_untracked:
	clean = '1'
else:
	clean = '0'

remote = ''

if not branch: # not on any branch
	branch = symbols['prehash']+ Popen(['git','rev-parse','--short','HEAD'], stdout=PIPE).communicate()[0][:-1]
else:
	remote_name = Popen(['git','config','branch.%s.remote' % branch], stdout=PIPE).communicate()[0].strip()
	if remote_name:
		merge_name = Popen(['git','config','branch.%s.merge' % branch], stdout=PIPE).communicate()[0].strip()
		if remote_name == '.': # local
			remote_ref = merge_name
		else:
			remote_ref = 'refs/remotes/%s/%s' % (remote_name, merge_name[11:])
		revgit = Popen(['git', 'rev-list', '--left-right', '%s...HEAD' % remote_ref],stdout=PIPE, stderr=PIPE)
		revlist = revgit.communicate()[0]
		if revgit.poll(): # fallback to local
			revlist = Popen(['git', 'rev-list', '--left-right', '%s...HEAD' % merge_name],stdout=PIPE, stderr=PIPE).communicate()[0]
		behead = revlist.splitlines()
		ahead = len([x for x in behead if x[0]=='>'])
		behind = len(behead) - ahead
		if behind:
			remote += '%s%s' % (symbols['behind'], behind)
		if ahead:
			remote += '%s%s' % (symbols['ahead of'], ahead)

out = '\n'.join([
	str(branch),
	remote,
	staged,
	conflicts,
	changed,
	untracked,
	clean])
print(out)

